The Linux kernel operates in a virtual memory mode: for every virtual page there is a corresponding physical page of memory in the system.
Linux内核工作于虚拟内存模式：每一个虚拟页对应一个相应的系统内存的物理页。
The whole user mode page doesn't need to be locked in memory as with Direct I/O, which is the plus side of this.
整个用户态的页不需要再像直接访问输入输出那样被锁定，这是它的好的方面。
A set of kernel mode procedures that executes as the result of a page fault. The pager and the image activator provide the operating system's memory management functions.
当产生缺页中断时执行的一组核心态程序，它与映象激活程序一起提供操作系统的存储管理功能。
A set of kernel mode procedures that executes as the result of a page fault. The pager and the image activator provide the operating system's memory management functions.
当产生缺页中断时执行的一组核心态程序，它与映象激活程序一起提供操作系统的存储管理功能。
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